Superfamily Argiopoidea 



eighth to one fifth inch in length, and they vary so much in 

 colour, size, and markings that it is difficult to distinguish them. 

 One of the four Z. rufipes is a Mexican species, which has been 

 found in Texas; a second, Z. sexpunctatus, is found only in the 

 Southern States. 



The males of these four species are separated as follows by 

 the Peckhams; the females must be distinguished by differences 

 in the epigynum. 



KEY TO MALES OF ZYGOBALLUS 



A. Face and sides of cephalothorax, beyond the second row of 

 eyes, covered thickly with white scales. Tibia of the 

 first legs about four times as long as wide. 

 B. Cephalothorax with a large white spot at the beginning 

 of the thoracic slope. Bulb of palpus with a longitu- 

 dinal division. P. 698. Z. sexpunctatus 

 BB. Cephalothorax with no white spot on thorax. Bulb of 

 palpus with a transverse division. P. 697. Z. bettinii 

 AA. Sides of cephalothorax dark, or covered with rather in- 

 conspicuous whitish scales. Tibia of the first legs either 

 from five to six times as long as wide or only two and one 

 half times as long as wide. 

 B. Patella and tibia of the first legs long and slender, the 

 tibia from five to six times as long as wide. Found 

 only in Texas and farther south. Z. rufipes 

 BB. Joints of the first legs comparatively short. Tibia 

 two and one half times as long as wide. Found in New 

 England and as far south as Virginia. P. 698. 



Z. nervosus 



Zygoballus bettinii (Z. bet-ti'ni-i). — When living this is a very 

 beautiful spider, having spots of white hairs and shining bronze 

 and copper-coloured scales. The male is bronze-brown, with the 

 face and sides of the cephalothorax beyond the second row of 

 eyes covered thickly with white scales, and with a basal and two 

 transverse bands of white on the abdomen. The female is also 

 bronze-brown; it has a white basal band on the abdomen, and 

 two short, longitudinal, angular, white bands on the front part of 

 the abdomen: and several whitish chevrons on the hind part. I Ik- 

 form of the epigynum is shown in Fi,u. 767. This is a common and 



097 



